Add three regression test cases for cross-package interface private method calls: 1. _cmptest/issue1370_gotypes/ - Tests go/types.Object interface with Scope.Insert() which calls the private setParent() method 2. _cmptest/issue1370_goast/ - Tests go/ast.Expr interface conversion with ast.Ident which has a private exprNode() method 3. _cmptest/issue1370_geometry/ - Tests custom geometry.Shape interface with private methods (validate, setID) across package boundaries These tests verify the fix in ssa/abitype.go correctly sets the interface metadata's PkgPath to the interface definition package instead of the compilation package, preventing segmentation faults when calling private methods. Generated with [codeagent](https://github.com/qbox/codeagent) Co-authored-by: luoliwoshang <51194195+luoliwoshang@users.noreply.github.com>
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